# Known Bugs in Original Code

## Leap-Frog Elevation Bug

**Location:** `Trav-ler-Rotor-For-HAL-2.05/travler_rotor.py` lines 98-105

**Issue:** The elevation delta section of the leap-frog algorithm modifies
`target_az` instead of `target_el`. This is a copy-paste error from the
azimuth section above it.

**Original code (lines 90-105):**
```python
# Azimuth compensation (correct)
if target_az - current_az > 2:
    target_az+=1
elif target_az - current_az < -2:
    target_az-=1
elif target_az - current_az > 1:
    target_az+=0.5
elif target_az - current_az < -1:
    target_az-=0.5

# Elevation compensation (BUG: modifies target_az instead of target_el)
if target_el - current_el > 2:
    target_az+=1              # <-- should be target_el
elif target_el - current_el < -2:
    target_az-=1              # <-- should be target_el
elif target_el - current_el > 1:
    target_az+=0.5            # <-- should be target_el
elif target_el - current_el < -1:
    target_az-=0.5            # <-- should be target_el
```

**Impact:**
- Elevation leap-frog compensation was never applied, so the dish would
  lag behind in elevation during fast satellite passes
- Azimuth received double compensation (its own delta + the elevation delta),
  causing over-correction on the azimuth axis

**Affected repos:**
- `saveitforparts/Trav-ler-Rotor-For-HAL-2.05` — `travler_rotor.py` lines 98-105
- `saveitforparts/Travler-Pro-Rotor` — same bug copy-pasted into `travler_pro_rotor.py`

**Fix:** In `travler_rotor.leapfrog.apply_leapfrog()`, the elevation
compensation correctly modifies `target_el`.